Time

In my opinion what is most important is to be consistent with your study time. I believe that shorter increments every single day is better than studying one day each week.

Not sure what you mean by "lesson." Are you referring to the length of time you should spend per session? Or the amount of time you should spend for each lession? (e.g. Lesson 1.7 or 2.1). If you are referring to sessions, shorter and more frequent sessions are probably better. I try to spend 30 minutes a day several times a week. Unfortunately, my schedule does not allow me to spend too much time learning Spanish. If you are referring to each lesson, it varies drastically. Some of the earlier lessons, I only went over once. But some of the later lessons, I had to go over several times before I had a firm grasp of the content. Some lessons are easier than others and a set time per lesson is not practical (or effective).

Rebekah M2, Random1 makes valid points in regards to a "lesson". In Rocket Spanish, under the "My Toolbox" tab I have found the "Advanced Learning Techniques" valuable.

I find that after going through the entire course (including grammar portions); that I can always go back and review a lesson over and learn something new. In effect, I may have missed some subtleties on the first go round. Keeping in mind that boredom can set in if you spend too much time in a particular lesson, I believe is is best to spend 30 mins per day; with the understanding that it will likely solidify certain points to go back and listen/ study the same sections again after the course is "completed."

While I can see how going through each lesson and completing the course before re-reviewing earlier sections might make the process less boring, I don't think this is a good idea for most people. I personally think one should get a decent grasp of each lesson before moving on. For many lessons this only requires going over it once. For other lessons, more time might be needed. Each person learns differently, so perhaps Hernan G's strategy works best for him. I can't see myself doing this though as I will likely confuse myself and only get a superficial understanding of each concept.